Exploit for Trojan.Win32.Autoit.fhj MVID-2022-0638 NULL DACL

## https://sploitus.com/exploit?id=PACKETSTORM:168288
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/d871836f77076eeed87eb0078c1911c7_B.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Trojan.Win32.Autoit.fhj  
Vulnerability: Named Pipe Null DACL  
Family: Autoit  
Type: PE32  
MD5: d871836f77076eeed87eb0078c1911c7  
Vuln ID: MVID-2022-0638  
Disclosure: 09/06/2022  
Description: The malware creates two processes "xservice.exe" and a child process "xps.exe". The process creates an IPC pipe with a NULL DACL allowing RW for the Everyone user group.  
  
RManFUSCallbackNotify32   
RManFUSServerNotify32  
  
\\.\Pipe\RManFUSCallbackNotify32  
RW Everyone  
  
Local low privileged users can modify the DACL to remove rights for the Everyone users group, denying access to use the pipe for further RW interprocess communications.  
  
Exploit/PoC:  
#include "windows.h"  
#include "stdio.h"  
#include "accctrl.h"  
#include "aclapi.h"  
  
/*  
Trojan.Win32.Autoit.fhj.d871836f77076eeed87eb0078c1911c7   
NamedPipe Exploit Deny Access to Everyone  
By Malvuln  
**/  
  
#define VULN_TROJAN_PIPE "\\\\.\\pipe\\RManFUSCallbackNotify32"  
  
int main(void){  
  
HANDLE hPipe = CreateFileA((LPCSTR)VULN_TROJAN_PIPE, GENERIC_WRITE | WRITE_DAC, 0, NULL, OPEN_EXISTING, NULL, NULL);  
PACL pOldDACL = NULL;  
PACL pNewDACL = NULL;  
  
if (hPipe == INVALID_HANDLE_VALUE){   
printf("%d", GetLastError());   
return 1;  
}  
  
if(GetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pOldDACL, NULL, NULL) != ERROR_SUCCESS){  
printf("%d", GetLastError());  
return 1;  
}  
  
TRUSTEE trustee[1];  
trustee[0].TrusteeForm = TRUSTEE_IS_NAME;  
trustee[0].TrusteeType = TRUSTEE_IS_GROUP;  
trustee[0].ptstrName = TEXT("Everyone");  
trustee[0].MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;  
trustee[0].pMultipleTrustee = NULL;  
  
EXPLICIT_ACCESS explicit_access_list[1];  
ZeroMemory(&explicit_access_list[0], sizeof(EXPLICIT_ACCESS));  
  
explicit_access_list[0].grfAccessMode = DENY_ACCESS;   
explicit_access_list[0].grfAccessPermissions = GENERIC_ALL;  
explicit_access_list[0].grfInheritance = NO_INHERITANCE;  
explicit_access_list[0].Trustee = trustee[0];  
  
if(SetEntriesInAcl(1, explicit_access_list, pOldDACL, &pNewDACL) != ERROR_SUCCESS){  
printf("%d", GetLastError());  
return 1;  
}  
  
if(SetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, pNewDACL, NULL) != ERROR_SUCCESS){   
printf("%d", GetLastError());  
return 1;   
}else{  
printf("Trojan.Win32.Autoit.fhj PWNED!\n");  
printf("By Malvuln\n");  
}  
  
LocalFree(pNewDACL);  
LocalFree(pOldDACL);  
CloseHandle(hPipe);  
  
system("pause");  
  
return 0;  
}  
  
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